Car Stopping Distance Calculator

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The calculator below estimates the stopping distance for a well maintained car with an alert driver on a dry road. Obviously actual stopping distances will vary considerably depending on condition of the road and car as well as the alertness of the driver

Enter the car's speed in either miles or kilometers per hour and the stopping distance will be calculated.

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Speed

miles per hour

km per hour

Thinking Time

Thinking time used in The Highway Code

Custom time seconds

Thinking Distance

feet

This is the distance the car travels in the time it takes the driver to see the hazard, decide to brake and actually apply the brakes and is directly proportional to speed.

meters

Braking Distance

feet

This is the distance the car travels while the brakes are applied and is proportional to speed squared.

meters

Total Stopping Distance

feet

meters

This calculator is based on interpolating or extrapolating the stopping distance data from the British highway code which can be found here.

Whilst I try to keep the information on this site accurate, I'm only human and I do occasionally make mistakes.
I therefore advise you to check any information before using it for anything important. If you do find any errors, please let me know so that I can correct them.